var win = null;

function NewWindow(mypage,myname,w,h,scroll){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable' 
	win = window.open(mypage,myname,settings)
}

function navOn(navelem) {
    document[navelem].src = "/b/images/nav_arrow_over.gif";
}

function navOff(navelem) {
	document[navelem].src = "/b/images/spacer.gif";
}